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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530583e1abad9924ae42adec6ff920d5bd3250bb6e0125d07ec47042bfacf17e' 
  AND token = '4cFDU2NkGOAPI5esE4Z/wxpSQw1MmWbie85fO0Mt6vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}